Am I going wrong somewhere....?

My 4 week old son is not letting me get much sleep for the last 4
nights. He used to b/feed and go to sleep and wake up every 3 hours.
Now he seems to be waking up evry half hour or every hour. I feel like
a zombie in the mornings because I have had hardly any sleep. When I
feed him, he seems to fall asleep after being on the breast for just
5-10 minutes. I can tell he isnt full but dont know how to keep him
awake. Friends have suggested that he might be too warm - but how to I
keep him cool? I worry that if I dont put enough layers on him, he
might get cold.... Friends have also told me not to carry him in my
arms when feeding him, because he is getting too cozy and that I
should feed him lying down and have his body away from mine - but this
position is ever so uncmfortable. Also, when I start to breast feed
him his mouth gets so full he latches off the breast and starts to cry
- I dont know whether he is choking on the milk or what.

Some one please help me on this. This is my first baby and sometimes I
feel like I am doing something wrong or my baby isnt well.

Is this colic or what?

Also, can someone please explain to me what "growth spurt" is?